Computational optimization of pressure wave reflection on the piston surface for single point autoignition gasoline engine with colliding pulsed supermulti-jets leading to noiseless-high compression and nearly-complete air-insulation

Aya Hosoi, Remi Konagaya, Sota Kawaguchi, Yasuhiro Sogabe, Yuya Yamashita, Ken Naitoh

研究成果: Conference article

抄録

A new engine concept based on pulsed supermulti-jets colliding at a small area around the chamber center was proposed in our previous research. It was expected to provide noiseless high compression ratio and nearly-complete air-insulation on chamber walls, leading to high thermal efficiency. In the previous reports, three-dimensional computations for the unsteady compressible Navier-Stokes equation were conducted, which were qualitative because of using regular grid method. This time, we develop a new numerical code in order to quantitatively simulate the compression level caused by the jets colliding with pulse. It is achieved by applying a staggered grid method to improve conservatibity of physical quantities at very high compression in combustion phenomena. Computations at a simple condition were fairly agreed with a theoretical value. Computational results obtained for a complex geometry of an engine by the new code had less error than one with previous codes. In addition, the results led us to an idea of new disposition of nozzles to achieve higher compression ratio. Furthermore, we tried to optimize the effect of pressure wave reflection on the piston surface by changing the movement of piston in order to achieve higher compression ratio leading to lower exhaust energy.

元の言語English
ジャーナルSAE Technical Papers
2019-April
発行部数April
DOI
出版物ステータスPublished - 2019 4 2
イベントSAE World Congress Experience, WCX 2019 - Detroit, United States
継続期間: 2019 4 92019 4 11

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Pistons
Gasoline
Insulation
Compaction
Engines
Compression ratio (machinery)
Air
Navier Stokes equations
Nozzles
Geometry
Hot Temperature

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering

これを引用

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abstract = "A new engine concept based on pulsed supermulti-jets colliding at a small area around the chamber center was proposed in our previous research. It was expected to provide noiseless high compression ratio and nearly-complete air-insulation on chamber walls, leading to high thermal efficiency. In the previous reports, three-dimensional computations for the unsteady compressible Navier-Stokes equation were conducted, which were qualitative because of using regular grid method. This time, we develop a new numerical code in order to quantitatively simulate the compression level caused by the jets colliding with pulse. It is achieved by applying a staggered grid method to improve conservatibity of physical quantities at very high compression in combustion phenomena. Computations at a simple condition were fairly agreed with a theoretical value. Computational results obtained for a complex geometry of an engine by the new code had less error than one with previous codes. In addition, the results led us to an idea of new disposition of nozzles to achieve higher compression ratio. Furthermore, we tried to optimize the effect of pressure wave reflection on the piston surface by changing the movement of piston in order to achieve higher compression ratio leading to lower exhaust energy.",
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AU - Konagaya, Remi

AU - Kawaguchi, Sota

AU - Sogabe, Yasuhiro

AU - Yamashita, Yuya

AU - Naitoh, Ken

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